Experimental Study And Numerical Simulation Of Heated Discharge In Tidal Area

With the rapid development of the national economy, more and more thermal/nuclear power plants have been put into operation in the coastal areas. The cooling water system is an important part of the thermal / nuclear power plant , it is generally taken seawater for cooling water, waste water will be injected into the receiving waters from the outfall. Large quantity of waste heat water discharged not only increase the temperature of receiving waters area, and will effects of water quality and water produces, seriously , thermal pollution may occurs. Therefore, it has to be considered in the construction phase of power plant how layout appropriately the project of the intake and discharge water to intake low-temperature water,dissipate fully waste heat into the environment water area and prevent heat pollution.Numerical simulation and physical simulation was used for prediction of thermal discharge receiving waters'flow field and temperature field , the results can be provided basis for the location and type of outlet for the plant design and the environment evaluation .In this paper, application with the hybrid scheme of fractional step to solving the control equation of the plane two-dimensional incompressible fluid based on deepness average, combined with specific arrangement of intake and outfall conditions, the thermo-hydraulic behaviors have been studied systematically by physical model and numerical simulation in rectangle flume, where transverse heated discharge flow into steady homogenization and fresh-salt water mixing water area. The main contents:1.Looking up extensive literature,research methods and means of numerical simulation and physical modeling of cooling water thermal effluent are understood comprehensively,issues related to numerical simulation are further explored.2.On the basis of research of predecessors, analyze the similar principle of hydraulic and thermal characteristic,as well as the simulation outline in cooling water's physical model in tidal area.3. According to engineering arrangements which is surface drainage and deep intake, carrying out experiments systematically on different tidal range, different depths and different upstream flow run off to research the thermo-hydraulic behaviours.4. Analysis influence of tidal range, depth, upstream flow on temperature thermal properties of water.Provide different conditions the average temperature distribution of the whole tidal and the average intaking temperature rise in the vertical distribution. The results showed that the temperature of the homogeneous water discharge, heat water stratification clear layout of the table row deep help plants get access to low water.5. A plane two-dimensional shallow water circulation models are established using the principle of average depth,and the control equations are dispersed and solved in triangular grid using the hybrid scheme of fractional step. Carried out using FORTRAN language program development and debugging.6. Select the calculation domain and the calculation conditions corresponding to physical model test, carry out numerical simulation of power plant thermal discharge in tidal area's flow field and temperature field. And compared with physical simulation results, obtained satisfactory results. The average temperature distribution of the whole tidal and the heat water equivalent of the average temperature rise with the tide almost the same range of fluctuation.